Online PHP editor | output for t1nGR

<?php if(isset($_POST['UserEmail'])&&isset($_POST['P_word'])){ $UserEmail = $_POST["UserEmail"]; $P_word = $_POST["P_word"]; $P_word_hash = md5($P_word); if (!empty($UserEmail)&&!empty($P_word)){ $query = "SELECT 'UserEmail', 'P_word' FROM 'userslogin' WHERE 'UserEmail' = '$UserEmail' And 'P_word' = '$P_word_hash'"; if ($query_run = mysql_query($query)){ $query_num_rows = $query_num_rows($query_run); if($query_num_rows ==0){ echo 'invalid username or password.'; } else if ($query_num_rows==1){ //$user_id = mysql_result($query_run, 0, 'UserEmail'); //$_SESSION('userid') = $user_id; echo 'well done'; echo 'Welcome <a href="logout.php">Log out</a>';//not sure about header('Location: Homepage.php');// create a homepage } } } ?>